Add ignore next warning control comment

lib/processor.js

@@ -5,7 +5,8 @@ let insertAreas = require('./hacks/grid-utils').insertAreas
 
 const OLD_LINEAR = /(^|[^-])linear-gradient\(\s*(top|left|right|bottom)/i
 const OLD_RADIAL = /(^|[^-])radial-gradient\(\s*\d+(\w*|%)\s+\d+(\w*|%)\s*,/i
-const IGNORE_NEXT = /(!\s*)?autoprefixer:\s*ignore\s+next/i
+const IGNORE_NEXT = /(!\s*)?autoprefixer:\s*ignore\s+next(?!\s+warning)/i
+const IGNORE_NEXT_WARNING = /(!\s*)?autoprefixer:\s*ignore\s+next\s+warning/i
 const GRID_REGEX = /(!\s*)?autoprefixer\s*grid:\s*(on|off|(no-)?autoplace)/i
 
 const SIZES = [
@@ -55,6 +56,13 @@ class Processor {
    * Add necessary prefixes
    */
   add(css, result) {
+    // Mark nodes before prefixes are inserted between them and comments
+    css.walkComments(comment => {
+      if (IGNORE_NEXT_WARNING.test(comment.text) && comment.next()) {
+        comment.next()._autoprefixerIgnoreWarning = true
+      }
+    })
+
     // At-rules
     let resolution = this.prefixes.add['@resolution']
     let keyframes = this.prefixes.add['@keyframes']
@@ -366,7 +374,7 @@ class Processor {
     }
 
     // Values
-    return css.walkDecls(decl => {
+    css.walkDecls(decl => {
       if (this.disabledValue(decl, result)) return
 
       let unprefixed = this.prefixes.unprefixed(decl.prop)
@@ -378,6 +386,16 @@ class Processor {
       }
       Value.save(this.prefixes, decl)
     })
+
+    // Remove warnings hidden by ignore next warning control comments
+    result.messages = result.messages.filter(i => {
+      return !(
+        i.type === 'warning' &&
+        i.plugin === 'autoprefixer' &&
+        i.node &&
+        i.node._autoprefixerIgnoreWarning
+      )
+    })
   }
 
   /**